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mattmccutchen-cci avatar mattmccutchen-cci commented on May 26, 2024

OTOH, according to the POSIX realloc man page, realloc should always be considered to free the memory associated with its argument. By that interpretation, any dereference of p after the call realloc(p,...) is a temporal safety violation; i.e., Checked C doesn't purport to help there.

FWIW, the above is my point of view. realloc should be analyzed as a combination of malloc, free, and copying the data up to the minimum of the two sizes; the fact that the returned pointer is often equal to the original is implementation-dependent behavior.

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sulekhark avatar sulekhark commented on May 26, 2024

Thanks Mike and Matt. I agree that after realloc(p, ...) any dereference of p is a temporal safety violation. I will add a section in the spec stating that at present Checked C does not purport to detect temporal memory safety violations and explain the particular case of realloc.

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sulekhark avatar sulekhark commented on May 26, 2024

Documented.

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